Cities With Non-Hour UTC Offsets
Adelaide runs on an unusual offset of UTC+09:30, one of the world's few clocks not set to a whole hour.
Cities with at least 50,000 residents; 100 cities shown.
Top Cities Ranked by UTC offset
Methodology: Calculated from the IANA Time Zone Database using the offset and daylight-saving rules in effect at the update time.
Why Do Some Cities Use Non-Hour UTC Offsets?
Most of the world runs on whole-hour offsets from UTC, but a handful of places use half-hour or even quarter-hour offsets. India and Sri Lanka run at UTC+5:30, Nepal at an unusual UTC+5:45, parts of Australia at UTC+9:30, and a few regions use 45-minute offsets. These quirks usually reflect history, geography or a deliberate choice to sit between two neighbours.
Half- and quarter-hour zones can be a headache for scheduling international calls and flights. The cities here all use one of these offbeat offsets; Adelaide runs at UTC+09:30.